Stats quiz 1

statistics

a collection of procedures and principles for gaining and analyzing information to educate people and help them make better decisions when faced with uncertainty.

descriptive statistics

consists of methods for organizing and summarizing information. There is no generalized conclusion. RAW Data is presented in a useful format.

Inferential Statistics

consists of method for drawing and measuring the reliability of conclusions about a population based on information obtained from a sample of the population. You are able to learn from the sample and make a conclusion.

Population

The collection of all individuals or items under consideration in a statistical study

Sample

That part of the population from which information is obtained

Observational Study

Researchers simply observe characteristics and take measurements, observe whatever the data gives you

Designed Experiment

researchers impose treatments and controls, and then observe characteristics and take measurements

cenus

obtaining information for the entire population of interest. Often not conducted due to the amount of time it takes, the amount of money it costs, and its impracticality.

simple random sampling

a sampling procedure for which each possible sample of a given size is equally likely to be the one obtained.

simple random sample

a sample obtained by simple random sampling

representative sample

should reflect, as closely as possible, the characteristics of the population under consideration.

sampling with replacement

randomly pick an item from a group, record its details and return it to the group before making the next pick (ex. rolling a dice, flipping a coin)

sampling without replacement

item selected from the population is not replaced/put back.